The method of upgrade depends on your hardware/os
(1) For installs on RPi:
Simply issue following commands:
sudo apt update
sudo apt upgrade
(2) For installs on a x86_x64 (AMD64) PC:
The method of upgrade depends on how the existing install was done.
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(a) For install done by building and installing piaware packages from source-code, the packages should be built again using source code of ver 11.1
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(b) For installs done through QEMU, simply run following commands
sudo apt update
sudo apt upgrade